Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb961583c855530…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 18:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb3ecee06f1985f7f2cc6b24b69b963f SHA-1: c0a7d2c549239428f86c8008ad16132a2496a2ce SHA-256: 8bb961583c85553093bd13e38e36d6ae073be98f321088f37dcc7078912c4519
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, including WordPress uploads, which is a common tactic for phishing and malware distribution. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=photoshop+7.0+torrent
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/64014964745.pdf
    • https://polandpools.com/contents/files/98467777427.pdf
    • https://eniedu.com/data/file/20210909193735.pdf
    • http://chongthamnguoc.vn/img/files/30683801224.pdf
    • https://plentis.eu/ckfinder/userfiles/files/44174791299.pdf
    • http://creaorganization.com/depo/sayfaresim/file/46538181603.pdf
    • http://jfhcoaching.com/userfiles/files/jafojutasakato.pdf
    • https://tahitotfalu.hu/ckfinder/userfiles/files/debevanipor.pdf
    • http://wedding-box100.com/uploads/files/202109021518097807.pdf
    • http://benevolo.it/userfiles/files/lopudufebatemufejafiwa.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e20e591743---bezizujiropo.pdf
    • http://mirutte.com/newsfiles/files/28432712403.pdf
    • http://srsheicha.com/uploadfile/file/tizewik.pdf
    • http://etalentlink.com/uploadfile/file///2021091602534738.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/229b997913dbbacd1106f61f50a6174e/49986798132.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161334ace448a2---51597995415.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/44197676300.pdf
    • http://corporatiegids.nl/uploads/files/75219053398.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/496147225.pdf
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/57736194252.pdf
    • https://sedefartphotography.com/resimler/files/genozowaxiritewuxuga.pdf
    • https://stallion-international.com/userfiles/file/6780498311.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d424.bin
6b719864886a0c646901141c7a74d82f547f661e984042cb66a486663377f276
pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 17872 bytes
font_01_sfnt_off0001024f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 16792 bytes
font_02_sfnt_off00011a66.bin
c198ec974a3a3ce6a5e6c09409aacd265be2a19a33f0e54c049a60c0be675391
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 10288 bytes